Control apparatus



O. P. HIPPLE.

CONTROL APPARATUS.

APPLICATION FILED JAN. 6. 1917.

1,349,3 0, Patented Aug. 10,1920.

INVENTOR I I MW Wag/5 ATTORNEY WITNESSES:

UNITED STATES PATENT OFFICE.

OLIVER r. HIPPLE, or WILKINS TOWNSHIP, ALLEGHENY COUNTY, PENNSYLVANIA,

AssIGNoE T0 WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, ACOR- PORATION OF PENNSYLVANIA.

CONTROL APPARATUS.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filed January 6, 1917. Serial No. 140,943.

To all whom it may concern:

Be it known that I, OLIVER P. HIrPLE, a citizen of the United States, and a resident of Wilkins townshig) in the county of Allegheny and State 0 lennsylvama, have mvented a new and useful Improvement in Control Apparatus, of which the following is a specification.

My invention relates to control apparatus and especially to contact segments that are mounted upon control drums and the l ke.

The object of my invention is to provide relatively simple and inexpensive means whereby a contact segment of suitable length may be mounted upon a control drum by means of a single screw or other secur ng means, the curvature of the segment being such that the inner corners thereof may be readily embedded in the drum body, thereby preventing rotative movement of the segment around the screw.

More specifically stated, it is the ob ect of my invention to provide relatively short Contact segments, for control drums, having radii of curvature that are materially less than that of the drum itself, whereby the cost of necessary materials is reduced to a considerable degree and the assembly of parts is greatly facilitated.

My invention may best be understood by reference to the accompanying drawlng, wherein Figure 1 is a plan view of a control drum embodying my present invention; Fig. 2 is a fragmentary view, in elevation, of the structure shown n Fig. 1; and Fig. 3 is a perspective view of a tool which is preferably employed in connection with my invention.

Referring to the drawing, the apparatus shown comprises a control drum 1 of a familiar type which is preferably composed of wood, or a similar material and is rigidly mounted upon a central shaft 2, in accordance with a familiar practice; my contact segment 3 and a single screw 4 or other securing means for centrally attaching the segment to the drum body.

The contact segment 3 has a radius of curvature that is materially less than that of the drum body, as is obvious from the corresponding dimension lines 5 and 6, respectively. Consequently, the inner corners 7 and 8 of the contact segment 3 are readily adapted to be embedded in the wooden drum, thereby serving to effectively prevent rotative movement of the segment around the single screw 4 and alsotending to maintain the contact segment in its proper position even after the aperture in the segment has worn to a larger diameter than the screw-head.

The preferred method of assembly of the illustrated contact segment is as follows: The segment 3 is fitted over the screw 4 which is then inserted into the drum body at the proper point and tightened until the inner corners 7 and 8 of the contact segment just touch the drum surface. By then properly alining the contact segment and striking it a couple of well-directed blows, preferably using the setting tool 9 that is shown in Fig. 3, the inner corners 7 and 8 may be readily embedded in the wooden drum, whereupon the screw 4; may be fully tightened. Thus, the contact segment is securely held in its proper position, even though only a single screw 4, with theconsequent economy of labor and material, is employed.

A further advantage of the illustrated structure resides in the fact that the contact pressure between the segment 3 and the usual cooperating control fingers (not shown) is gradually increased from the instant of initial contact to the completion of the notch or step of the control drum which corresponds to the central plane of the contact segment.

It will be understood that the advantages of my present invention are best secured in connection with contact segments of relatively short length, such as single-notch segments for reverser drums, for example,

and having external and internal cylindrical surfaces of radii of curvature less than that of the drum with which the segment is associated.

2. A contact segment for a control drum having a relatively small radius of curvature with respect thereto, whereby the inner corners of the segment may be embedded in the drum body.

3. The combination with a control drum of wood or similar material, of a contact segment and a single means for securing said segment to said drum, the segment having a relatively small radius of curvature with respect to the drum, whereby its inner corners may be embedded in the drum body to prevent rotative movement of the segment.

4:. A control drum embodying a contact segment located on the cylindrical surface of the drum and having a radius of curvature less than that of the drum 5. A control drum embodying a contact segment having a radius of curvature less than that of the drum and a single securing means for the segment, the edges of said segment being embedded jn the body of said drum to prevent rotative movement of the segment around said securing means.

6. A. control drum embodying a contact segment the inner surface of which has a radius of curvature less thanthat of the drum and having its inner corners embedded in the drum body, and a single threaded member for securing said segment to said drum.

7. A controller drum having a contact segment of less radius than said drum and driven into the cylindrical surface of said drum. I p

8. A controller drum of given radius having a contact segment of smaller radius pro-' OLIVER P. HIPPLE. 

